goldberg_emulator/overlay_experimental/windows/DX11_Hook.cpp

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#include "DX11_Hook.h"
#include "Windows_Hook.h"
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#include "../Renderer_Detector.h"
#include "../../dll/dll.h"
#ifndef NO_OVERLAY
#include <imgui.h>
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#include <impls/windows/imgui_impl_dx11.h>
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DX11_Hook* DX11_Hook::_inst = nullptr;
HRESULT GetDeviceAndCtxFromSwapchain(IDXGISwapChain* pSwapChain, ID3D11Device** ppDevice, ID3D11DeviceContext** ppContext)
{
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HRESULT ret = pSwapChain->GetDevice(IID_PPV_ARGS(ppDevice));
if (SUCCEEDED(ret))
(*ppDevice)->GetImmediateContext(ppContext);
return ret;
}
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bool DX11_Hook::start_hook()
{
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bool res = true;
if (!hooked)
{
if (!Windows_Hook::Inst()->start_hook())
return false;
PRINT_DEBUG("Hooked DirectX 11\n");
hooked = true;
Renderer_Detector::Inst().renderer_found(this);
BeginHook();
HookFuncs(
std::make_pair<void**, void*>(&(PVOID&)DX11_Hook::Present, &DX11_Hook::MyPresent),
std::make_pair<void**, void*>(&(PVOID&)DX11_Hook::ResizeTarget, &DX11_Hook::MyResizeTarget),
std::make_pair<void**, void*>(&(PVOID&)DX11_Hook::ResizeBuffers, &DX11_Hook::MyResizeBuffers)
);
EndHook();
get_steam_client()->steam_overlay->HookReady();
}
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return res;
}
void DX11_Hook::resetRenderState()
{
if (initialized)
{
mainRenderTargetView->Release();
pContext->Release();
ImGui_ImplDX11_Shutdown();
Windows_Hook::Inst()->resetRenderState();
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ImGui::DestroyContext();
initialized = false;
}
}
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// Try to make this function and overlay's proc as short as possible or it might affect game's fps.
void DX11_Hook::prepareForOverlay(IDXGISwapChain* pSwapChain)
{
DXGI_SWAP_CHAIN_DESC desc;
pSwapChain->GetDesc(&desc);
if (!initialized)
{
ID3D11Device* pDevice = nullptr;
if (FAILED(GetDeviceAndCtxFromSwapchain(pSwapChain, &pDevice, &pContext)))
return;
ImGui::CreateContext();
ImGuiIO& io = ImGui::GetIO();
io.IniFilename = NULL;
ID3D11Texture2D* pBackBuffer;
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pSwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
pDevice->CreateRenderTargetView(pBackBuffer, NULL, &mainRenderTargetView);
pBackBuffer->Release();
ImGui_ImplDX11_Init(pDevice, pContext);
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pDevice->Release();
get_steam_client()->steam_overlay->CreateFonts();
initialized = true;
}
if (ImGui_ImplDX11_NewFrame())
{
Windows_Hook::Inst()->prepareForOverlay(desc.OutputWindow);
ImGui::NewFrame();
get_steam_client()->steam_overlay->OverlayProc();
ImGui::Render();
pContext->OMSetRenderTargets(1, &mainRenderTargetView, NULL);
ImGui_ImplDX11_RenderDrawData(ImGui::GetDrawData());
}
}
HRESULT STDMETHODCALLTYPE DX11_Hook::MyPresent(IDXGISwapChain *_this, UINT SyncInterval, UINT Flags)
{
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DX11_Hook::Inst()->prepareForOverlay(_this);
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return (_this->*DX11_Hook::Inst()->Present)(SyncInterval, Flags);
}
HRESULT STDMETHODCALLTYPE DX11_Hook::MyResizeTarget(IDXGISwapChain* _this, const DXGI_MODE_DESC* pNewTargetParameters)
{
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DX11_Hook::Inst()->resetRenderState();
return (_this->*DX11_Hook::Inst()->ResizeTarget)(pNewTargetParameters);
}
HRESULT STDMETHODCALLTYPE DX11_Hook::MyResizeBuffers(IDXGISwapChain* _this, UINT BufferCount, UINT Width, UINT Height, DXGI_FORMAT NewFormat, UINT SwapChainFlags)
{
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DX11_Hook::Inst()->resetRenderState();
return (_this->*DX11_Hook::Inst()->ResizeBuffers)(BufferCount, Width, Height, NewFormat, SwapChainFlags);
}
DX11_Hook::DX11_Hook():
initialized(false),
hooked(false),
pContext(nullptr),
mainRenderTargetView(nullptr),
Present(nullptr),
ResizeBuffers(nullptr),
ResizeTarget(nullptr)
{
_library = LoadLibrary(DLL_NAME);
}
DX11_Hook::~DX11_Hook()
{
PRINT_DEBUG("DX11 Hook removed\n");
if (initialized)
{
mainRenderTargetView->Release();
pContext->Release();
ImGui_ImplDX11_InvalidateDeviceObjects();
ImGui::DestroyContext();
initialized = false;
}
FreeLibrary(reinterpret_cast<HMODULE>(_library));
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_inst = nullptr;
}
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DX11_Hook* DX11_Hook::Inst()
{
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if (_inst == nullptr)
_inst = new DX11_Hook;
return _inst;
}
const char* DX11_Hook::get_lib_name() const
{
return DLL_NAME;
}
void DX11_Hook::loadFunctions(IDXGISwapChain *pSwapChain)
{
void** vTable;
vTable = *reinterpret_cast<void***>(pSwapChain);
#define LOAD_FUNC(X) (void*&)X = vTable[(int)IDXGISwapChainVTable::X]
LOAD_FUNC(Present);
LOAD_FUNC(ResizeBuffers);
LOAD_FUNC(ResizeTarget);
#undef LOAD_FUNC
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}
#endif//NO_OVERLAY